.middle {
    width: 1000px;
    height: 600px;
    margin:50px auto;
    border: 1px solid red;
}
.middle>div:first-child{
    color: #e69137;
    font-size: 30px;
    /*margin: 10px;*/
    padding: 10px;
    border-bottom: 1px solid red;
}
.middle>div:nth-child(2){
    height: 400px;
}